Boom cylinder lower pin. Customer needed to remove cylinder for rebuild and could not get it out so he cut it and left the pcs. in the ears , then called me. Most times now I don't even try to heat and remove because it usually doesn't work out plus this had all the hoses in close proximity. I just start on cutting it out. First if possible I drill through about 3/8" diameter. First a 1/8" or 3/16"pilot. This way you don't get blow back from the torch. If that is not possible I'll use the airarc to make a through hole. This time drill was fine.


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Mini excavator pin removal
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Mini excavator pin removal
Last edited by MMW; 09-14-2021, 04:53 PM.MM250
Trailblazer 250g
22a feeder
Lincoln ac/dc 225
Victor O/A
MM200 black face
Whitney 30 ton hydraulic punch
Lown 1/8x 36" power roller
Arco roto-phase model M
Vectrax 7x12 band saw
Miller spectrum 875
30a spoolgun w/wc-24
Syncrowave 250
RCCS-14Tags: None
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Once I have through holes I use the torch to carefully cut fron inside out. After it is opened up the heat and material removed let it shrink some and it usually taps right out. Small amount of heat is transferred to the ears and no scaring of bore if careful. Also no chance of breaking ears off because you aren't pounding on it. You can see in the second pic the far ear where I assume he heated it and the near ear the paint is still visible. A little clean up with a file and good as new. 1-1/4 hours total.
MM250
Trailblazer 250g
22a feeder
Lincoln ac/dc 225
Victor O/A
MM200 black face
Whitney 30 ton hydraulic punch
Lown 1/8x 36" power roller
Arco roto-phase model M
Vectrax 7x12 band saw
Miller spectrum 875
30a spoolgun w/wc-24
Syncrowave 250
RCCS-14
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Great technique to keep in mind.Smith Oxyacetylene Torch
Miller Dynasty 200DX
Lincoln SP-250 MIG Welder
Lincoln LE 31 MP
Lincoln 210 MP
Clausing/Colchester 15" Lathe
16" DoAll Saw
15" Drill Press
7" x 9" Swivel Head Horizontal Band Saw
20 Ton Arbor Press
Bridgeport
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What a pain. Four little 1” pins caused me so much trouble, but your method worked just fine. I meant to take some pictures but I got wrapped up in the work. After I cut what was hanging out off, I had to burn through about 4” of pin. I drilled a 1/4” hole through and got after it. I had some trouble with it closing up, but I managed. I think the bigger the hole the better, but how long do you want to spend on drilling? Thanks for posting the tip.
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Closing up is why I suggest 3/8 or bigger hole. Once you have a pilot hole opening it up further goes quickly. Once the hole closes with slag you get blow back and it's hard to get it through again. I would rather spend a little more time drilling than being showered in sparks. Glad you got it done.MM250
Trailblazer 250g
22a feeder
Lincoln ac/dc 225
Victor O/A
MM200 black face
Whitney 30 ton hydraulic punch
Lown 1/8x 36" power roller
Arco roto-phase model M
Vectrax 7x12 band saw
Miller spectrum 875
30a spoolgun w/wc-24
Syncrowave 250
RCCS-14
- 1 like
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